/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

package org.apache.iotdb.flink.tsfile;

import org.apache.flink.util.Collector;
import org.apache.flink.util.FlinkRuntimeException;
import org.apache.iotdb.tsfile.common.conf.TSFileConfig;
import org.apache.iotdb.tsfile.exception.write.WriteProcessException;
import org.apache.iotdb.tsfile.write.record.TSRecord;
import org.apache.iotdb.tsfile.write.schema.Schema;

import java.io.IOException;

/**
 * Output format that writes TsFiles by {@link TSRecord}. Users need to provide a {@link
 * TSRecordConverter} used to convert the upstream data to {@link TSRecord}.
 *
 * @param <T> The input type of this output format.
 */
public class TSRecordOutputFormat<T> extends TsFileOutputFormat<T> {

    private final TSRecordConverter<T> converter;

    private transient TSRecordCollector tsRecordCollector = null;

    public TSRecordOutputFormat(String path, Schema schema, TSRecordConverter<T> converter) {
        this(path, schema, converter, null);
    }

    public TSRecordOutputFormat(Schema schema, TSRecordConverter<T> converter) {
        super(null, schema, null);
        this.converter = converter;
    }

    public TSRecordOutputFormat(
            String path, Schema schema, TSRecordConverter<T> converter, TSFileConfig config) {
        super(path, schema, config);
        this.converter = converter;
    }

    @Override
    public void open(int taskNumber, int numTasks) throws IOException {
        super.open(taskNumber, numTasks);
        converter.open(schema);
        tsRecordCollector = new TSRecordCollector();
    }

    @Override
    public void close() throws IOException {
        converter.close();
        super.close();
    }

    @Override
    public void writeRecord(T t) throws IOException {
        try {
            converter.convert(t, tsRecordCollector);
        } catch (FlinkRuntimeException e) {
            throw new IOException(e.getCause());
        }
    }

    private class TSRecordCollector implements Collector<TSRecord> {

        @Override
        public void collect(TSRecord tsRecord) {
            try {
                writer.write(tsRecord);
            } catch (IOException | WriteProcessException e) {
                throw new FlinkRuntimeException(e);
            }
        }

        @Override
        public void close() {
        }
    }

    public TSRecordConverter<T> getConverter() {
        return converter;
    }
}
